Independent side-by-side comparison of RetatrutidePen.co and Saiyan Med — third-party lab grades, tested purity, COA availability, FDA warnings, and community ratings.
Bottom line: Saiyan Med holds the stronger independent lab grade (ungraded vs A); RetatrutidePen.co has more published third-party tests (1 vs 0).
Every figure below is either measured by an independent laboratory or read from the vendor's own website, and the source is named against it. PeptideAtlas is not affiliated with either vendor.
RetatrutidePen.co: 1 independent Janoshik assay, median measured purity 99.3%, most recent 2025-10-06. Saiyan Med has no independent Janoshik assays on file.
| Attribute | RetatrutidePen.co | Saiyan Med |
|---|---|---|
| Independent lab grade | Not graded | A |
| Third-party tests | 1 test, avg purity 99.3% | None published |
| COA available | Yes | Yes |
| Endotoxin tested | No | No |
| FDA warnings | None on record | None on record |
| Production country | Not specified | Hong Kong / China |
| Year established | Unknown | 2026 |
| Substance | RetatrutidePen.co | Saiyan Med |
|---|---|---|
| Retatrutide 10mg | 99.28% (1 assay, latest 2025-10-06) | Not tested |
| Checked | RetatrutidePen.co | Saiyan Med |
|---|---|---|
| Certificates of analysis | Not stated | None found on the site |
| Products listed | Not stated | 59 |
| Public pricing | Not stated | Listed on the site |
| Ships to | Not stated | United States, United Kingdom, Europe, Canada, Australia, Asia, Worldwide |
| Research-use-only notice | Not stated | Published |
| Stated origin | Not stated | Hong Kong |
RetatrutidePen.co. RetatrutidePen.co: 1 independent Janoshik assay, median measured purity 99.3%, most recent 2025-10-06. Saiyan Med has no independent Janoshik assays on file. These are third-party Janoshik assays published against the vendor, not the vendor's own certificates.
RetatrutidePen.co states that COAs are available, and we found no certificates of analysis anywhere on Saiyan Med's site. A published COA is the vendor's own document; the assay figures elsewhere on this page are independent of it.
RetatrutidePen.co does not state a shipping region, and Saiyan Med states it ships to United States, United Kingdom, Europe, Canada, Australia, Asia, Worldwide. Both are read from the vendors' own sites.
Full profiles: RetatrutidePen.co, Saiyan Med.
Full lab-test records: All 1 RetatrutidePen.co lab test.
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